Remove redundant line-height declarations from elements.css

Remove redundant line-height declarations from elements.css

Elements.css declares line-height of 1.5em for certain common
elements, like ol, ul and dd. These are redundant as each skin already
declares the same line-height for the content, and all elements inherit
this line-height from the body.

At the same time, these declaration override the content line-height of
1.6em set in Vector, creating inconsistencies that cannot be 'hacked'
away. Removing these line-height declarations has no impact, other
then making the typography refresh actually work as intended.

Bug: T66653
Change-Id: I5b682a9527294e96f3999773724cbf8fb9631197